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(No Model.)

A. WEBER.

ANGLE ATTACHMENT FOR DENTAL ENGINES.

No. 299,040. Patente'dMaJy 20, 1884.

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AUGUST WEBER, OF NEYV YORK, N. Y., ASSIGNOR OF ONE-HALF TO GEORGE E.HODGE, OF SAME PLACE.

ANGLE ATTACHMENT roe DENTAL ENGINES.

SPECIFICATION forming part of Letters Patent No. 299,040, dated May 20,1884:.

Application filed January 518, 1884. (No model.)

To to whom it may concern:

Be it known that I, AUcUsr WEBER, of the city and State of New York,have invented an Improvement in Angle Attachments for Dental Engines, ofwhich the following is a specification.

Angle attachments have heretofore been made for dental engines in whichthe tool is held in a revolving stock; but in consequence of the smallspace in the mouth where such angle attachment usually is employed it isdifficult to make the parts sufficiently small. Besides this, if thereis any looseness of the drill or tool in the stock, the tool doesnetwork accurately, and is liable to be broken or to come out of thestock.

My invention is for securing the tool into the stock in a very firmmanner, so that it cannot become loose in use, and there is no risk ofthe tool coming out of the chuck, nor of the stock binding or becomingtoo loose in the holder, and the parts are very compact and strong andoccupy but little space.

In the drawings, Figure 1 is a side view of the attachment in about theordinary size. Fig. 2 is a longitudinal and Fig. 3 a cross 1 section atthe line m 00 in larger size of said attachment.

I make use of a holder in which is a rotary shaft, a, with a bevel-gearwheel, Z), at the end, which meshes into the gear-wheel c,- and d is thedrill or tooth, which is revolved for drilling or excavating dentalcavities. These parts are of a character corresponding generally to thedevices shown in English Patent No. 1,017 of 1864. The shaft to passesthrough the tubular bearing f, and at g is a sleeve, screwed at 2 to thebearing f. This sleeve 9 is split so as to be elastic, and it is slippedover the end of the ordinary dental hand-piece, and the shaft a isgrasped by the chuck or toolholder of the hand-piece, so as to berevolved thereby. The stock his tubular, and passes over the bearing f,and is secured by the screw at 3, and in this stock h there is a crosshole or opening, either at right angles or at an inclination t0 theshaft a. The drill or tool (Z is received within the chuck e, the endportion 4. of which is split longitudinally at two or more places, andit is conical and provided with a screw-thread, 5, at its upper end.There is a tubular shaft, i, formed with or attached to the bevel-gearc, and this shaft is made with aconical end, 6, setting into the side ofthe stock h, which is recessed for its reception, so that this conicalportion 6 forms a bearing that receives the pressure when the drill ortool is pressed to its work, In order to hold this tubular shaft inplace, Iintroduce at the other end the conical collar a, forming abearing against the stock h, and the nut 0, screwed upon the tubularchuck 6, holds the parts in place, and also causes the chuck to graspand hold the tool. The tubular shaft *6, the chuck c, and the collar amust all turn together, and the rotation must not tend to loosen the nut0. To effect these objects I introduce a pin, 8, in the tube of thechuck, the outer end of which passes into a notch at the upper end ofthe tubular shaft t'and into a notch in the eye of the washer or bearinga, and the inner end of this pin 8 projects Within the tubular chuck c,and the inner end of the tool (I is removed at one side to pass by thepin, and formed with a notch at r, so that after the tool has beeninserted into the chuck it is partially rotated to bring the notch r tothe pin 8, and then the nut o is screwed up to tighten the chuck. Thechuck centers and holds the tool tightly, and the pin 8 and notch rprevent the tool being drawn out if the chuck should become loose, andthe pin insures the rotation of the tool by the revolution of the gear 0and tubular shaft 2'.

It will be apparent that this improved angle attachment is adapted todental drills and tools of any description, and that the parts are verycompact and reliable.

It is usually preferable to employ the cap 1), hinged at 9 to the stockh, and kept down by a s'pringcatch at 10, so as to prevent the rotatingnut 0 coming into contact with the mouth or any part of the person.

It will be apparent that in cases where it is not desired to clamp thetool the tube that receives the tool may be whole, instead of beingsplit at one end, and in cases where the inner end of the nut is of thesame shape as the conical washer such washer may be dispensed with orformed as one with the nut, the other parts remaining the same.

I claim as my invention l. The combination, with the shaft a, thebevel-gears, and tool, of the tubular bearing f for the shaft a, the.screw 3, and the stock h,

screwed upon the tubular bearing, substan- I 5 ceive, clamp, and holdthe tool, substantially as set forth.

3. The combination, with the shaft a, the bevel-gears, and the stockh,'of a tubular shaft having a conical bearing at one end, a

conical washer surrounding the other end,

and a nut to secure the parts in place, sub stantially as set forth.

4. The combination, with the stock, shaft, and bevel-gears, of a tubularshaft having a conical end bearing, a chuck within such shaft forholding the tool, and a nut for closing the chuck and clampingthe tool,substantially as set forth.

5. The combination, with the stock, shaft, and bevel gears, of a tubularshaft having an end bearing, a chuck within such shaft, a washer forminga bearing against the stock, and a nut to act upon the chuck and holdthe tool, substantially as specified.

6. The tubular shaft having an end bearing, in combination with thebevel-gearing, the washer, the nut, and a pin acting to insure therotation together of the chuck, the tubular shaft, the washer, and thetool, substantially as set forth.

7 The combination, with the angle attachment for dental engines,containing a clamp ing chuck and nut, of a movable cap covering the nut,substantially as set forth.

Signed by me this 22d day of January, A.D. 1884.

A. WVEBER.

Witnesses:

GEO. T. PINOKNEY, WILLIAM G. MOTT. 5

